I would like to provide you with the quickest way to delete your multiple contacts! First, I would need to know what kind of phone you have. Are you using Backup Assistant or Gmail to backup your contacts? Are the contacts duplicated when you log into either of those accounts? If they are only duplicated in the phone, you would be able to master reset your device and re-sync the contacts to the phone. This may be the most effective way if you have a lot of contacts.
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The only way to delete easy is a master reset an iPhone. I would rather delete one by one instead of taking more time to do my music and everything . Is that the only suggestion?